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Encyclopedia > 2005 FY9
2005 FY9
Discovery A
Discoverer Michael E. Brown,
Chad Trujillo,
David Rabinowitz
Discovery date March 31, 2005
Alternate
designations
B
none
Category Trans-Neptunian object
Orbital elements C
Epoch January 28, 1955 (JD 2435135.5)
Eccentricity (e) 0.159
Semi-major axis (a) 6850.2 Gm (45.791 AU)
Perihelion (q) 5760.7 Gm (38.508 AU)
Aphelion (Q) 7939.7 Gm (53.0736 AU)
Orbital period (P) 113179 d (309.868 a)
Mean orbital speed 4.419 km/s
Inclination (i) 28.963°
Longitude of the
ascending node
(Ω)
79.3816°
Argument of
perihelion
(ω)
298.407°
Mean anomaly (M) 85.14653°
Physical characteristics D
Dimensions 1600 – 2000 km
Mass  ?×10? kg
Density  ? g/cm³
Surface gravity  ? m/s²
Escape velocity  ? km/s
Rotation period  ? d
Spectral class  ?
Absolute magnitude -0.4
Albedo 0.8 ± 0.2
Mean surface
temperature
~? K

2005 FY9 (also written 2005 FY9), codenamed "Easterbunny" by its discoverers, is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown. Its discovery was announced on July 29, 2005 on the same day as two other very large trans-Neptunian objects, 2003 EL61 and 2003 UB313. Dr. Michael (Mike) E. Brown has been an associate professor of planetary astronomy at the California Institute of Technology (Caltech) since 2002. ... Chadwick A. Chad Trujillo (born November 22, 1973) is a postdoctoral scholar at Caltech researching the Kuiper belt and the outer solar system. ... David L. Rabinowitz (born 1960) is a professor at Yale University researching the Kuiper belt and the outer solar system. ... March 31 is the 90th day of the year in the Gregorian Calendar (91st in Leap years), with 275 days remaining. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... Minor planets, or planetoids are minor bodies of the Solar system orbiting the Sun (or of other planetary systems orbiting other stars) that are larger than meteoroids (the largest of which might be taken to be around 10 meters or so across) but smaller than major planets (Mercury having a... A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... January 28 is the 28th day of the year in the Gregorian calendar. ... 1955 (MCMLV) was a common year starting on Saturday of the Gregorian calendar. ... The Julian day or Julian day number (JDN) is the number of days that have elapsed since 12 noon Greenwich Mean Time (UT or TT) on Monday, January 1, 4713 BC in the proleptic Julian calendar . ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... giga- (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ... The metre, or meter, is a measure of length. ... The astronomical unit (AU or au or a. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... A day (symbol: d) is a unit of time equal to 24 hours. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1/360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... For the majority of numbered asteroids, almost nothing is known apart from a few physical parameters. ... Mass is a property of a physical object that quantifies the amount of matter it contains. ... The international prototype, made of platinum-iridium, which is kept at the BIPM under conditions specified by the 1st CGPM in 1889. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... Gravity is a force of attraction that acts between bodies that have mass. ... In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling back or staying in an orbit within a... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Asteroids are assigned a type based on spectral shape, color, and sometimes albedo. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us. ... Albedo is the measure of reflectivity of a surface or body. ... Temperature is also the name of a song by Sean Paul. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... The Kuiper belt (KYE per) is an area of the solar system extending from within the orbit of Neptune (at 30 AU) to 50 AU from the sun, at inclinations consistent with the ecliptic. ... March 31 is the 90th day of the year in the Gregorian Calendar (91st in Leap years), with 275 days remaining. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... Dr. Michael (Mike) E. Brown has been an associate professor of planetary astronomy at the California Institute of Technology (Caltech) since 2002. ... July 29 is the 210th day (211th in leap years) of the year in the Gregorian Calendar, with 155 days remaining. ... 2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ... A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ... 2003 EL61 (also written 2003 EL61), nicknamed Santa (non-official designation), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ...


The designation 2005 FY9 is only provisional. Given the importance of the object and the fact that it has been found on older photographs (precovered), it may receive a proper name soon. According to the current naming rules of the International Astronomical Union, it will be named after a creation or underworld deity. The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge... A sepia-tinted photograph of an English couple, taken in 1895. ... Precovery is a term used in astronomy that describes the process of finding the image of an object (usually a minor planet) in old archived images or photographic plates, for the purpose of calculating a more accurate orbit. ... Logo of the IAU The International Astronomical Union (French: Union astronomique internationale) unites national astronomical societies from around the world. ... Look up Creation in Wiktionary, the free dictionary Creation is the following: Generally, creation is the act or result of bringing something into existence from nothing at all. ... // In the study of mythology and religion, the underworld is a generic term approximately equivalent to the lay term afterlife, referring to any place to which newly dead souls go. ... Look up deity in Wiktionary, the free dictionary. ...

Contents


Physical characteristics

Size

The albedo of 2005 FY9 remains unknown leading to a significant uncertainty in the object’s size. The detection in infrared by the Spitzer space telescope, combined with the similarities of spectrum with Pluto yield a conservative estimate of 1660 km. This is similar to the size of 2003 EL61 making 2005 FY9 the largest known Kuiper belt object after 2003 UB313 and Pluto. However, should the albedo prove to be closer to that of Quaoar for example, the size of the object diameter could reach 3000 km. 2005 FY9 is currently visually the second brightest Kuiper belt object after Pluto having the apparent magnitude of nearly 17. Therefore it is visible to high-end amateur telescopes. The Spitzer Space Telescope Facility launches from Cape Canaveral Air Force Station in Florida on Monday, Aug. ... This article is about the trans-Neptunian object. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... Amateur astronomy, often called back yard astronomy, is a hobby whose participants enjoy observing celestial objects. ... 50 cm refracting telescope at Nice Observatory. ...


Spectra

In a recent paper, Licandro et al. showed that the surface of 2005 FY9 resembles that of Pluto by measuring its visible and near infrared spectrum using the William Herschel Telescope and Telescopio Nazionale Galileo. Legend: γ = Gamma rays HX = Hard X-rays SX = Soft X-Rays EUV = Extreme ultraviolet NUV = Near ultraviolet Visible light NIR = Near infrared MIR = Moderate infrared FIR = Far infrared Radio waves: EHF = Extremely high frequency (Microwaves) SHF = Super high frequency (Microwaves) UHF = Ultrahigh frequency VHF = Very high frequency HF = High frequency... This article is about the telescope on the Canary Islands. ... The Telescopio Nazionale Galileo, or TNG is a 3. ...


The object appears red in the visible spectrum (see colour comparison for TNOs). A trans-Neptunian object (TNO) is any object in the solar system which orbits the sun at a greater distance on average than Neptune. ...


The infrared spectrum is marked by the presence of methane (CH4) as observed on both Pluto and 2003 UB313. However, 2003 UB313 presents neutral (and not red) spectrum. In addition 2003 UB313 is a scattered disk object, implying much wider "seasonal" changes than for the classical objects. R-phrases S-phrases , , , Flash point −188°C Autoignition temperature 537°C Explosive limits 5–15% Supplementary data page Structure and properties Thermodynamic data Spectral data UV, IR, NMR, MS Related compounds Related alkanes Ethane Propane Related compounds Methanol Chloromethane Except where noted otherwise, data are given for materials in... 2003 UB313 is a trans-Neptunian object (TNO) believed to be larger than the planet Pluto. ... The scattered disc (or scattered disk) is a distant region of our solar system, thinly populated by icy planetoids known as scattered disk objects (SDOs), a subset of the broader family of trans-Neptunian objects (TNOs). ...


The presence of methane, even more prominent that on Pluto, leads to a possibility that 2005 FY9 could have a similar transient atmosphere as Pluto near perihelion. Atmosphere is the general name for a layer of gases that may surround a material body of sufficient mass. ... A diagram of Keplerian orbital elements. ...


Satellites

No satellites have been detected so far which distinguish 2005 FY9 from the other largest known trans-Neptunian objects: 2003 UB313 (1 satellite), 2003 EL61 (2) and Pluto (3). Satellites are quite common among the TNOs and the estimated 10% to as many as 20% of all objects are expected to have one or more satellites.


Discovery circumstances

Despite its relative brightness, 2005 FY9 was not discovered until fairly recently, well after many much fainter Kuiper belt objects. This is probably due to its relatively high orbital inclination, and the fact that its angular distance from the ecliptic was near maximum at the time of its discovery (in the northern constellation of Coma Berenices). Most searches for minor planets are conducted relatively close to the ecliptic, due to the greater probability of finding objects there. Inclination in general is the angle between a reference plane and another plane or axis of direction. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ... Coma Berenices (Latin for Berenices Hair) is a traditional asterism that has since become a constellation. ...


However, at the time of Clyde Tombaugh's discovery of Pluto, 2005 FY9 was only a few degrees from the ecliptic, near the border of Taurus and Auriga. Unfortunately, this position was also very near the galactic equator, making it almost impossible to find such an object within the dense concentration of background stars of the Milky Way. Tombaugh continued searching for some years after the discovery of Pluto, but he failed to find 2005 FY9 or any other trans-Neptunian objects. Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer who discovered the planet Pluto in 1930. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... Taurus (Latin for bull, symbol , Unicode ♉) is one of the constellations of the zodiac. ... Auriga (Latin for chariot) is a northern constellation. ... Many galaxies, including the Milky Way in which our Sun and Earth are located, are disk-shaped: the majority of their visible mass (excluding possible dark matter) lies very close to a plane. ...


Orbit

Orbits of 2005 FY9 (blue), 2003 EL61 (green) and Pluto (red).
Orbits of 2005 FY9 (blue), 2003 EL61 (green) and Pluto (red).

2005 FY9 is classified a classical Kuiper belt object and follows an orbit very similar to that of 2003 EL61: highly inclined (29°) and moderately eccentric (e~0.16). 2005 FY9 is slightly farther from the Sun (both the semi major axis and perihelion). Unlike Pluto and plutinos approaching the Sun closer than Neptune thanks to the resonance, the classical objects have perihelia further from the Sun, free from Neptune’s perturbation. Image File history File links TheKuiperBelt_Orbits_2003EL61_2005FY9. ... Image File history File links TheKuiperBelt_Orbits_2003EL61_2005FY9. ... 2003 EL61 (also written 2003 EL61), nicknamed Santa (non-official designation), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... Adjective Plutonian Atmospheric characteristics Atmospheric pressure 0. ... A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets. ... Artists rendering of the Kuiper Belt and hypothetical more distant Oort cloud. ... 2003 EL61 (also written 2003 EL61), nicknamed Santa (non-official designation), is a large and very unusual Kuiper belt object discovered by Mike Brown at Caltech in the United States. ... Inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit and is the angular distance of the orbital plane from the plane of the reference (usually planets equator or the ecliptic), stated in degrees. ... (This page refers to eccitricity in astrodynamics. ... In astronomy, a plutino is a trans-Neptunian object that has a 3:2 orbital resonance with Neptune. ... In celestial mechanics, orbital resonance occurs when two orbiting bodies have periods of revolution that are in a simple integer ratio so that they exert a regular gravitational influence on each other. ... In astrodynamics orbital perturbation is an effect on an objects orbit due to the range of external influences. ...


The diagram shows the similar orbits of the two cubewanos contrasted with the orbit of Pluto. The perihelia (q) and the aphelia (Q) are marked with the dates of passage. The present positions (as of April 2006) are marked with the spheres illustrating relative sizes and differences in albedo and colour. Both cubewanos are currently far from (above) the ecliptic (illustrated as Neptune orbit in grey). 2005 FY9 approaches its perihelion while 2003 EL61 passed its own in 1991. This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The plane of the ecliptic is well seen in this picture from the 1994 lunar prospecting Clementine spacecraft. ...


External links

References

  • Licandro, J.; Pinilla-Alonso, N.; Pedani, M.; Oliva, E.; Tozzi, G. P.; Grundy, W. M. The methane ice rich surface of large TNO 2005 FY_9: a Pluto-twin in the trans-neptunian belt? , Astronomy and Astrophysics, 445 (2006), pp.L35-L38 Abstract.
Large trans-Neptunian objectsedit
Kuiper belt: Pluto (Charon) | Orcus | Ixion | 2002 UX25 | Varuna | 2002 TX300 | 2003 EL61 | Quaoar | 2005 FY9 | 2002 AW197
Scattered disc: 2003 UB313 | 2004 XR190 | Sedna
 See also Triton, astronomical objects and the solar system's list of objects, sorted by radius or mass
For pronunciation, see: Centaur and TNO pronunciation.
† Current MPC classification. Some consider Sedna an Oort cloud object.
The minor planetsedit
Vulcanoids | Near-Earth asteroids | Main belt | Jupiter Trojans | Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt · Scattered disc · Oort cloud)
For other objects and regions, see: asteroid groups and families, binary asteroids, asteroid moons and the Solar system
For a complete listing, see: List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.

  Results from FactBites:
 
The Trans-Neptunian Object 2005 FY9 is Very Similar to Pluto (616 words)
The semi-major axis of its orbit is 46 Astronomical Units (AU, 1 AU=149,597,892 kilometres), the perihelion distance is 39 AU and the inclination of the orbit is 29°.
In fact, the absorption bands in the spectrum of 2005 FY are deeper than in the spectrum of Pluto as a result of the larger abundance of methane ice in 2005 FY Also the colour of the surface of the TNO is red (indicated by the slope of the spectrum), similar to that of Pluto.
The discovery that 2005 FY is very similar to Pluto provides astronomers with a new and exciting laboratory for the study of volatile mixing and transport, atmospheric freeze-out and escape, ice chemistry, and nitrogen phase transitions in Pluto-like objects.
2005 FY9 - Wikipedia, the free encyclopedia (413 words)
2005 FY (also written 2005 FY9), codenamed "Easterbunny" by its discoverers, is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown.
2005 FY was detected by the Spitzer space telescope.
[1] showed that the surface of 2005 FY resembles those of Pluto and 2003 UB by measuring its visible and near infrared spectrum using the William Herschel Telescope and Telescopio Nazionale Galileo.
  More results at FactBites »

 
 

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